Machine foe backing and hollowing cask staves



(No Model.) 2 Sheets-Sheet 1.

A. DUNBAR. MACHINE FOR BACKING AND HOLLOWING OASK STAVES.

No. 580,261. Patented Apr. 6, 1897.

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2 SheetsSheet 2.

(No Model.) A. DUN-BAR.

MAGHINE FOR BACKING AND HOLLOWING OASK STAVE'S. No. 580,261. PatentedApr. 6, 1897.

WITNESSES UNITED STATES PATENT OFFICE.

ALEXANDER DUNBAR, OF LIVERPOOL, ENGLAND.

MACHINE FOR BACKING AND HOLLOWING CASK-STAVES.

SPECIFICATION forming part of Letters Patent No. 580,261, dated April 6,1897.

Application filed May 20, 1896. Serial No. 592,259. (No model.) Patentedin England March 8, 1893, No. 5,000; in Spain February 5, 1894,1l0.15,487; in France February 8, 1894,11'0. 236,129; in Belgium February10, 1894,110. 108,661; in Italy February 19, 1894, No. 35,785; inGermany March 2, 1894, No. 79,058; in Austria July 13,1894, No. 3,198;in Hungary November 7, 1895, No. 4,517, and in Portugal January 20,1896, No. 2,067.

To all whom it may concern.-

Be it known that I, ALEXANDER DUNBAR, a subject of the Queen of GreatBritain, residing at Liverpool, in the county of Lancaster, England,have invented a new and useful Improvement in Machines for Backing andHollowing Cask-Staves, (for which I have obtained patents in GreatBritain, No. 5,000, dated March 8, 1893; in France, No. 236,129, datedFebruary 8, 1894; in Belgium, No. 108,661, dated February 10,1891; inGermany, No. 79,058, dated March 2, 1894; in Spain, No. 15,487, datedFebruary 5, 1894; in Italy, No. 35,785, dated February 19, 1894; inAustria, No. 3,198, dated July 13, 1894; in Hungary, No. 4,517, datedNovember 7, 1895, and in Portugal, No. 2,067, dated January 20, 1896,)of which the following is a specification.

Figure 1 is a plan of a machine constructed in accordance with myinvention for backing and hollowing cask-staves. Fig. 2 is averticaltransverse section at the line AA of Fig. 1, and Figs. 3, 4, and 5 arediagrammatic views illustrating the passage of the oscillatingcarrier-frame.

The object of the invention is to provide an effective machine forimparting the requisite transverse curvature,commonly called backing andhollowing, to the backs and fronts of staves used in making casks.

a are end frames secured to a bed-plate b and coupled by the bars orstruts c.

d d are cutters secured to disks 6 e on shafts ff. The shafts ff arecarried in bearings in the frames at and are caused to rotate by meansof belt-pulleys. The center disk of the shaft f is of larger diameterthan the end disks, so that the cutters cl, which act on the innersurface, may be adapted to the longitudinal curvature of the staves. Thesaid cutters (1 will vary in length and shape according to the lengthand shape of the inner joint of the staves. The lower cutters d, whichact on the back of the staves, are usually as long as the longest stavesthe machine will take, are straight, and are not changed according tothe length of the staves.

g is a frame carried by arms h, pivoted to the said frame at h and at t"to lugs or brackets 2', secured to the bed-plate b. The lower ends ofthe arms h and the lugs or bracketst' are made with three or morepivot-holes t" therethrough, so that the radial length of the arms itmaybe varied according to the diameter of the casks to be made by movingthe pivot-pins from one set of holes to another.

7t 1: are two gripper-bars free to slide to and fro in bearings in theends of the frame g.

I Z are screws carried in hearings in the frame g and passing throughnuts in the gripper-bars k One end of each screw has a right-handedthread, and the other end a lefthanded thread, so that as the screws Z Zare caused to rotate the bars 70 7tapproach or recede from each other,according to the direction in which the screws are turned. The screws Zl are fitted at their ends with bevelwheels m, which gear withbevel-wheels non a shaft 0, carried in bearings 0, affixed to the frameg.

p is a hand-wheel for giving motion to the screwl and by means of thegearing above mentioned simultaneously to the screw l.

q is a table on which the staves are placed.

r is a cam-lever pivoted at r to the bar 0*. The bar r is secured to theend frames at.

s are rods pivoted to the frame g and to a lever 25 at t. The lever tispivoted to abracket a on the base-plate b.

n is a cam on a shaft 5, carried in bearings b on the bed-plate b.

'w is a worm wheel and gear for giving motion to the shaft 5' and cam r.

are links connecting the lever 15 to parallel levers y, pivoted to thelugs y on the bedplate I).

as is a roller carried by the links :0.

The cam 5 acts against the roller 00.

g are set-screws passing through arms g secured to the frame g. Thelength of the arms and the position of the set-screws are such that thesaid set-screws may rest against the bar 2, connected to the two endframes at.

The action of the machine is as follows: The frame 9 being in theposition shown a stave j is placed on the table q and held firmly downby means of the camlever r. The hand-wheel p is then turned until thebars curvature on the back and front.

k k grip the stave tightly between them. clamp upon the table is thenreleased, as the table and clamp are employed merely for leveling andholding the stave in case it is warped, and the cam 1: acts on theroller and causes the frame 9 to travel in the direction of the arrow,so that the stave, which is thicker than the bars 70 7c, is carriedtrans versely and in a circular arc, owing to the pivotal arms h h,through between the cutters d d, which are caused to rotate rapidly. Thestave is thus given the desired transverse When the cam '12 has passedthe roller 09 the frame 9 falls back, owing to being on a slightincline, until the set-screws g strike against the bar 2, and the saidframe is again in the position shown on the drawings, where it remainsat rest until the cam 22 again acts on the roller 00'. While the frame gis at rest the handwheel p is turned until the gripper-bars release thestave. The said stave is then removed and replaced by another requiringto be backed and hollowed.

I claim 1. In apparatus for backing and hollowing staves, thecombination with parallel cuttershafts and cutters thereon, of anoscillating carriage substantially parallel with said shafts andarranged to swing transversely and carry the stave between the cutters;substantially as described.

2. In apparatus for backing and hollowing staves, the combination withparallel cutter-.

shafts and cutters thereon, one of said cutters having alongitudinally-curved cutting edge,

The I while the other is straight, of an oscillating carriagesubstantially parallel with said shafts and arranged to swingtransversely and carry the stave between the cutters; substantially asdescribed.

3. In machines for backing and hollowing cask-staves, the combination ofrotating cutters d d, adjustable oscillating frame g, stavegrippers k70, and operating-gear with a lever 15, connecting-rods s and cam '0 forgiving motion to the said lever substantially as set forth.

at. In apparatus for backing and hollowing staves, the combination withparallel cuttershafts and cutters thereon, of an oscillating carriagesubstantially parallelwi th said shafts and arranged to swingtransversely and carry the stave between the cutters, said carriagehaving grippers, and a table, having a temporary clamp arranged to leveland hold the stave; substantially as described.

5. In apparatus for backing and hollowing ALEXANDER DUNBAR.

Witnesses:

JAMES JoHNsoN, JNo. F. WV. Corr.

